AMR interpolation of edge-centered fields?

[BenWibking]

For electromagnetics and MHD (vector potential), it would be useful to be able to interpolate edge-centered fields from coarse to fine levels in a conservative way. From looking at the various interpolators that are in the code already, it looks like this does not yet exist in AMReX.

There is a mathematically elegant solution described here: https://ui.adsabs.harvard.edu/abs/2015JCoPh.302...21P/abstract

(This would also avoid the need for a "curl register" for constrained transport MHD.)